Dashboard 2.0: Can't save Layout Editor Request failed with status code 500

Dashboard
1

When I try to save the layout editor of dashboard 2.0 i get the error Request failed with status code 500.

How can I solve this?

Screenshot from 2025-03-18 09-01-23
Screenshot from 2025-03-18 09-01-231919×742 127 KB

Screenshot from 2025-03-18 09-02-24
Screenshot from 2025-03-18 09-02-24810×687 70.1 KB

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Screenshot from 2025-03-18 09-10-10

2

How is your node-red setup & how is it served? (home assistant / docker?, embedded device?, etc)

Any special changes to how node-red and dashboard are served (specific settings.js tweaks etc around http admin endpoint etc)?

Is it behind a reverse proxy (haproxy/nginx/etc)?

3

It's running in Docker on a Synology DS224+ nas using reverse proxy. Everything else works fine.

Screenshot_20250318_222202_DS finder
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Screenshot_20250318_222350_DS finder
Screenshot_20250318_222350_DS finder860×817 131 KB

4

Also when I connect to the Nodered docker container directly via port 18801 I get the 500 error while saving the edited dashboard.

5

Headers:

image
image916×884 105 KB

Response:

{"error":"Invalid URL"}

Payload:

{"dashboard":"16f8dcba58e35d0c","page":"53162992b7e393dd","key":"q8vw8tft9z8","changes":{"groups":[{"id":"df52653d2a483c2d","name":"Binnen","page":"53162992b7e393dd","width":"12","height":1,"order":1,"showTitle":false,"className":"","visible":"true","disabled":"false","groupType":"default","_users":["2967f5033b8d7ce8","732f637a49d77bcb","7dd3e1a547247c5e","d47bd5ca44d0f0c7","1d895e4e4f1f3914","ee56cf721cbfdfc6"]},{"id":"2938a2512d900e16","name":"Buiten","page":"53162992b7e393dd","width":"12","height":1,"order":2,"showTitle":false,"className":"","visible":"true","disabled":"false","groupType":"default","_users":["6f6887dee229c598","4879e828e4848b21","06ef2b12e7af69a3","5215d2e4edc21635"]}],"widgets":[{"id":"2967f5033b8d7ce8","type":"ui-slider","z":"88a13305.b12af","group":"df52653d2a483c2d","name":"","label":"Plafond Achter","tooltip":"","order":1,"width":"3","height":"2","passthru":false,"outs":"all","topic":"topic","topicType":"msg","thumbLabel":"always","showTicks":"always","min":0,"max":"100","step":"10","className":"","iconPrepend":"","iconAppend":"","color":"","colorTrack":"","colorThumb":"","showTextField":false,"enabled":true,"visible":true,"class":""},{"id":"732f637a49d77bcb","type":"ui-slider","z":"88a13305.b12af","group":"df52653d2a483c2d","name":"","label":"Plafond Achter 1","tooltip":"","order":2,"width":"3","height":"2","passthru":false,"outs":"all","topic":"topic","topicType":"msg","thumbLabel":"always","showTicks":"always","min":0,"max":"100","step":"10","className":"","iconPrepend":"","iconAppend":"","color":"","colorTrack":"","colorThumb":"","showTextField":false,"enabled":true,"visible":true,"class":""},{"id":"7dd3e1a547247c5e","type":"ui-slider","z":"88a13305.b12af","group":"df52653d2a483c2d","name":"","label":"Plafond Achter 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